C#•13mo ago

❔ System.AccessViolationException from Windows.Media.Audio.AudioPlaybackConnection (UWP)

For familiarity, AudioPlaybackConnection on UWP enables an A2DP sink Bluetooth profile connection between Windows and another device (for receiving audio playback). Following https://learn.microsoft.com/en-us/windows/uwp/audio-video-camera/enable-remote-audio-playback, the app crashes on TryCreateFromId():

            ConnectionInfo = $"Connecting to {CurrentDevice?.Name ?? "selected device"}...";
            
            try
            {
                using var connection = AudioPlaybackConnection.TryCreateFromId(device.DeviceInformation.Id);

                await connection.OpenAsync();

                ConnectionInfo = $"▷ Connected to {CurrentDevice?.Name ?? "device"}";
            }
            catch (Exception x)
            {
                _ = await ShowDialogueAsync($"An error occurred while trying to open a connection:\n\n\n{x}", "Error");
                Disconnect();
            }

            ConnectionInfo = $"Connecting to {CurrentDevice?.Name ?? "selected device"}...";
            
            try
            {
                using var connection = AudioPlaybackConnection.TryCreateFromId(device.DeviceInformation.Id);

                await connection.OpenAsync();

                ConnectionInfo = $"▷ Connected to {CurrentDevice?.Name ?? "device"}";
            }
            catch (Exception x)
            {
                _ = await ShowDialogueAsync($"An error occurred while trying to open a connection:\n\n\n{x}", "Error");
                Disconnect();
            }

System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

As seen in the screenshot attached, this exception is a ghost. Does anyone have any idea how to debug this?

13 Replies

CrumpetMan•13mo ago

reflectronic•13mo ago

this happens every time?

CrumpetMan•13mo ago

Yeah... I'm gonna try changing architectures I swear .NET UWP is just broken at this point

reflectronic•13mo ago

a good place to start is by trying with mixed-mode debugger you would need visual studio for this

CrumpetMan•13mo ago

Mixed-mode as in enabling native-code debugging?

reflectronic•13mo ago

yeah

CrumpetMan•13mo ago

Alr

CrumpetMan•13mo ago

Got to the bottom of the call stack

CrumpetMan•13mo ago

Windows.Media.Devices.dll is the file. At this point in native debugging, you're supposed to compile a modified version of that file yourself? If anyone knows how to find the source file for bluetootha2dpplaybackconnection.cpp I'd appreciate it It'd provide a lot more insight on what's going on

reflectronic•13mo ago

sorry, didn't see this at this point you have debugged into windows source code and there isn't much you can do unless you are pretty good at reverse-engineering you'll need to black box debug this (maybe see if other devices have this problem? maybe try making your code more similar to the example in the documentation?), or find some contact at microsoft who can help you, or accept that this WinRT API is bugged like many others i am not sure how much luck you'll have, but you may want to post somewhere in $uwp that you're getting an access violation when calling this API

MODiX•13mo ago

https://discord.gg/eBHZSKG

reflectronic•13mo ago

it should not happen, no matter how you slice it, so there's definitely a bug to be fixed, and it's almost certainly in AudioPlaybackConnection itself

Accord•13mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ System.AccessViolationException from Windows.Media.Audio.AudioPlaybackConnection (UWP)